A WIRELESS MOBILE INFRARED COMMUNICATION DEVICE

Abstract

A WIRELESS MOBILE INFRARED COMMUNICATION DEVICE A wireless mobile infrared (IR) communication device (8) for communicating with mobile communication units (9) in vehicles (5, 6, 7), said IR communication device comprising an IR-transmitter (26) and an IR-receiver (29) for IR waves containing information, as well as a control unit (25) for controlling the transmitter (26), characterized in that the IR-receiver (29) and/or the IR-transmitter (26) includes focusing optics (14, 15) which has a directional characteristic (10, 10') for a selective communication with mobile communication units (9) in vehicles (5, 6, 7) at distances (D) of from 20 m to 200 m, and that an optic sighting unit (13) as well as an indication unit (16, 18) is provided, the indication unit being connected to the IR-receiver (29) via a processing unit.

Full Text

FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13]
aA WIRELESS MOBILE INFRARED COMMUNICATION DEVICE*
EFKON AG, an Austrian company of Andritzer Reichsstrasse 66, A-8045 Graz, Austria,
The following specification particularly describes the invention and the manner in which it is to be performed:

The present invention relates to a wireless mobile infrared communication device.
The invention relates to a wireless, in particular mobile, communication device for communicating with communication units in vehicles, comprising a transmit¬ter and a receiver for electromagnetic waves containing information, as well as a control unit for controlling the transmitter.
Various devices have been suggested for the wire¬less communication with vehicles on roads, freeways, or also in parking places, depending on the objectives en¬visaged. Basically, the most varying conventional com¬munication techniques are conceivable, such as GSM, UMTS, GPRS/ DSRC; etc. In particular, from WO 99/33027 so-called "virtual" toll stations are known which enter into a bi-directional communication with vehicles, or more precisely, with vehicle-borne communication
s
devices, when this toll site- is passed, so as to real¬ise the payment of a toll by linking position informa¬tion obtained, e.g., via GPS, with data stored in a device. Apart from the fact that locating the vehicles is comparatively unreliable, this involves an at least temporarily stationary toll site with a communication

device, wherein, moreover, communication is only-provided in a close range having a limited range of usually below 10 m. Furthermore, the communication devices are adapted such that they cover the total width of a roadway, wherein, in case of several lanes per roadway and, accordingly, of several vehicles mov¬ing in different lanes, a special technique is required to differentiate between the individual vehicles in the different lanes (the so-called "matching").
It would now be desirable to provide a selective, precisely targeting, in particular mobile communication device for wireless communication with selected vehicle-borne communication units (so-called OBUs - on board units) at arbitrary sites along roads or in park¬ing places, so as to be able to carry out a check -e.g. on a toll road - comparable to a speed check with a mobile laser device, as to whether or not a toll transaction has been carried out for the respective vehicle, or whether or not a parking fee has been paid. In this case, it should be possible to provide the mo¬bile communication device as a portable device, like a laser gun, optionally also as a vehicle-borne installa¬tion in a checking vehicle.

Accordingly, it is an object of the invention to provide a communication device for a precisely targeted data exchange with a moving or non-moving vehicle from arbitrary locations, from a person or from a vehicle, wherein a selective communication with the respective vehicle to be checked shall also be possible from lar¬ger distances.
Accordingly, the communication device of the ini¬tially mentioned type is characterized in that a direc¬tional characteristic is provided for the receiver and/or the transmitter, for a selective communication with communication devices in vehicles at distances in the order of from 20 m to 200 m, e.g. approximately 100 m, in particular with a receiving angle or angle of radiation of from 0.5° to 4°, preferably 0.8° to 2.5°, and in that a sighting unit as well as an indication unit is provided, the indication unit being connected to the receiver via a processing unit.
In the present communication device, there is provided a receiver and/or an active transmitter with a defined narrow receiving or radiation characteristic, respectively, which is adapted to select vehicles in the given distance range, e.g. 100 m or 150 m. The com-

munication device may work m a per se conventional manner with radio waves, respective antennas with a narrow directional characteristic having to be provided. Preferred, however, is a communication in the optic range, in particular in the infrared range, in which case the light transmitter, or the light receiv¬er, respectively, has an associated optics for achiev¬ing the narrow directional characteristic, i.e. beam focussing, or the reception restriction, respectively, so that a narrow focussed light beam, or IR-beam, re¬spectively, is achieved with this optics.
With the - optic - sighting unit, similar as with a portable laser device, the respective vehicle can be sighted, and within the given distance, e.g. 100 m, the sent out wave beam will reach exactly only this one vehicle, whereas other vehicles, e.g. in neighboring lanes, will not be covered (or will be blocked). In this manner, a selective communication in terms of the desired data exchange is possible in a simple manner. The data exchange will be used, e.g. for the purpose of checking - electronically - paid toll or parking fees, it being assumed that each of the vehicles has a so-called OBU unit installed therein. These vehicle-borne

communication devices (OBUs) normally will be in a standby (dormant) state, and they are activated at the above-indicated check so as to transmit the desired data to the mobile communication device.
To indicate data or, generally, information on the course of the communication, e.g. if a connection with the vehicle cannot be made, it is advantageous, if the indication unit has an optic display means, a display, in particular an LCD-display. Thereinstead or prefer¬ably, in addition thereto, also an acoustic indication means, e.g. a buzzer, may be provided, e.g. so as to allow for a corresponding acoustic indication for the operator by different buzzing sounds if a communication connection has been made or if a communication connec¬tion has failed to be made.
The data transmitted from the vehicle-borne commu¬nication unit and received by the communication device are processed in a per se conventional manner in a pro¬cessing unit following the receiver, so as to allow for an indication of these data, and this processing unit may advantageously be formed by a processor which also can put the data into an appropriate format for the in¬dication or also for a different output, as is conven-

tional per se.
The object of the control unit associated to the transmitter is to cause the transmitter in the desired manner to send out the electromagnetic waves for making the desired communication, wherein this activation of the transmitter should occur as automatic as possible; for this purpose, it is advantageous if the control unit for the transmitter is formed by a processor, preferably by the same processor which forms the pro¬cessing unit. It is of further advantage in this re¬spect if the processor is provided with a memory for information to be transmitted and received, respect¬ively. Moreover, it is also advantageous if the pro¬cessor is connected to an input unit, in particular keys, to input information and instructions. As de¬sired, e.g. depending on the site where the mobile com¬munication unit has been set up and depending on the type of inquiry, specific information, or inquiring data, respectively, can be prepared in this manner which then will be sent out in case a check is made. For this purpose, e.g., also the next freeway toll site associated with the site of set up can be identified by data.

As has already been mentioned, transmission, i.e. the sending out of the inquiring information, should largely be automatic, wherein, however, a purposeful triggering of the transmission procedure - e.g. when a vehicle approaches - shall be possible, and accord¬ingly, it is advantageous if the control unit for the transmitter has an associated trigger-like switch for triggering the transmitter for delivering electromag¬netic waves.
For the automatic transmission procedure it is ad¬vantageous if the control unit for the transmitter, op¬tionally the processor, has an associated memory for pre-determined transmission signal informations, with a wake-up signal for the vehicle communication unit and with command signals for the vehicle communication unit so as to cause the latter to identify and deliver stored information, in particular status information and information regarding toll transactions.
For a check, optionally for a documentation, it is also suitable if a date and time indication fed by a clock signal generator of the processor is provided. In case a check is made, the data received by the vehicle-borne communication unit can then be stored together

with the data regarding date and time and, e.g., can be printed as a protocol by means of a printer contained in the portable device or by an external printer. It is, of course, also conceivable to store at first the received data together with the data regarding the time in a memory, and to output them later via an external printer, optionally after connection to a PC with a printer.
To be; able to keep the data regarding the respect¬ive next toll site associated to the checking site for a longer period of time, the communication device suit¬ably is provided with a memory for storing a toll site identification.
The invention will now be explained in more detail by way of preferred exemplary embodiments illustrated in the drawings to which, however, it shall not be re¬stricted. In detail,
Fig. 1 shows a schematic top view onto a part of the roadway comprising three lanes, with vehicles and with a mobile communication device according to the present invention;
Fig. 2 shows, in a perspective view, a communica¬tion device according to the present invention, in the

form of a portable device;
Fig. 3 schematically shows - partly as a block diagram - an inventive communication device in combina¬tion with a vehicle-borne communication unit communic¬ating therewith; and
Fig. 4 shows a flow chart to illustrate the pro¬cedure during a data exchange in the course of a se¬lective communication between the present communication device and a vehicle-borne communication unit.
In Fig. 1, a roadway 1 comprising three lanes 2, 3, 4 is schematically illustrated, on which there are vehicles 5, 6 and 7. At the border of the roadway 1, a mobile wireless communication device 8 is shown which selectively communicates with a vehicle-borne communic¬ation unit 9 in one of the vehicles, e.g. in vehicle 5; this is schematically indicated in Fig. 1 by a narrow, focussed infrared beam 10.
The distance D between the mobile communication device 8 and the vehicle 5 is, e.g., approximately 100 m, the radiation characteristic (cf. the narrow beam 10) of the communication device 8 is adapted to the selectivity with respect to the communication with vehicles at such a distance D, in accordance with the

maximum defined range, i.e. the angle (p of the radi¬ation and also of the receiving characteristic is ac¬cordingly small, e.g. in the order of 2°, generally, e.g., between 0.5° and 4° or 5°. In case of a range of 200 m, therefore, the beam 10 must be radiated with a correspondingly smaller radiation angle than in case of a range of 100 m or of merely 50 m, i.e. an even nar¬rower directional characteristic must be provided for the transmitter and for the receiver of the communica¬tion device 8. Thereby it is achieved that selectively only the one desired vehicle, e.g. 5 in Fig. 1, is covered, whereas other vehicles, e.g. in the other lanes 3, 4, are not covered, so that an undisturbed data exchange can occur with the one, desired vehicle 5. Such a data exchange is, e.g., desired in the course of a check as to whether or not the vehicle 5 has car¬ried out a toll transaction for paying a prescribed toll when previously passing a toll site. Accordingly, the vehicle-borne communication unit 9 must be activ¬ated (woken up) by the communication device 8 and caused to deliver an identification as well as to transmit the desired information regarding previous toll transactions. This procedure will be explained in

more detail herebelow, in particular by way of Figs. 3 and 4.
In Fig. 2, a mobile wireless communication device 8 designed as a portable hand tool is shown, wherein a housing 12 comparable to that in so-called laser guns is attached on a handle 11 through which electric con¬nection lines 11' (for energy supply and, optionally, data transmission) extend. On the upper side of housing 12, an optic sighting unit 13 is attached with which the desired vehicle, e.g. 5 (Fig. 1), can selectively be sighted so as to then deliver the transmission beam 10 (Fig. 1) via a transmitter not further illustrated in Fig. 2 and a focussing optics 14. To receive wave beams transmitted back from the respective vehicle-borne communication unit 9, a comparable optics 15 with a narrow receiving angle is provided which is mounted before the receiver proper in the interior of housing 12.
On the rear side of the hand unit facing the oper¬ator (not illustrated), an LCD display 16 is provided as an optic indication unit; furthermore, an input key¬board 17 is provided on this rear side of the unit, be¬low the LCD display 16, so as to be able to supply

corresponding input data to the control unit contained in housing 12 and in particular designed with a micro¬processor.
Laterally on housing 12, in the exemplary embodi¬ment illustrated, there is a buzzer-loudspeaker 18 so as to deliver certain predetermined buzzing sounds as an acoustic indication, depending on whether or not a communication with the vehicle has been achieved.
Furthermore, the communication device 8 is provided with a trigger-like switch 19 so as to trigger the transmitter, i.e. to cause it to radiate electro¬magnetic waves. This switch 19 may be located at any desired suitable site on the housing 12, or it may be preferably provided on the handle 11 so as to allow for an actuation by means of the thumb, e.g., in a comfort¬able manner.
In Fig. 3, the present mobile wireless communica¬tion device is shown at 8 and a vehicle-borne communic¬ation unit is shown at 9 at a distance D which, as shown, is not true to scale. The vehicle-borne commu¬nication unit 9 commonly is termed OBU unit (on-board unit), and it comprises a communication circuit 20 in¬cluding a transmitter 21 and a receiver 22 as well as a

microprocessor 23. The microprocessor 23 furthermore has an associated memory 24 in which all the various data relating to toll transactions as well as an iden¬tification number and the like are stored.
In the mobile communication unit 8, within housing 12, a microprocessor 25 connected to the switch 19 is provided as a control unit for a transmitter 26. Moreover, a memory 27 for data corresponding to the signals to be transmitted as well as a memory 28 for storing data received via a receiver 29 and processed by the microprocessor 25 acting a processing unit are connected to the microprocessor. In Fig. 3, further¬more, optics 14 and 15, respectively, for achieving the narrow directional characteristics 10, and 10', re¬spectively, with an angle of aperture or receiving
angle cp in the order of, e.g., 0.5° to 5°, in particu¬lar 0.8° to 2.5°, are schematically illustrated. The
angle

ering one vehicle 5 only in the region of the maximum range (which may be 100 m or also 200 m), is ensured, i.e. a coverage of undesired vehicles which are in oth¬er lanes or in the same lane in front of or behind the chosen vehicles is prevented. It may be mentioned here that in case parking vehicles are checked, also smaller ranges, e.g. 20 m or 50 m, may suffice, in which case
also the angle

Furthermore, in Fig. 3 the LCD display 16 as well as the loudspeaker 18 are schematically illustrated. In case of-an inquiry from an OBU 9, the communication device 8 - via the sighting unit 13 - is directed to¬wards the vehicle to be checked, in which or on which the OBU 9 to be interrogated is mounted, e.g. towards vehicle 5 in Fig. l. when pressing the trigger-like switch 19, the transmitter 2 6 is activated so that it brings the OBU 9 in vehicle 5 from the standby state into the active state by means of a wake-up command. In its ready state, OBU 9 now is capable of transmitting back appropriate data to the communication device 8 in response to inquiry commands transmitted from transmit¬ter 26, such as, e.g., "answering-status" or "read out last transaction", it being ensured in the course of

this communication that selectively only data from the sighted OBU 9 will be received. At least parts of the received data, or processed data, respectively, will be displayed on the LCD display 16, and the result of the data communication ("correct", "incorrect", "no data") will also be acoustically signaled via loudspeaker 18 by delivering different buzzing sounds.
Vehicle-borne communication units (OBUs) 9 from other vehicles will not be activated in this selective communication; in case other OBUs 9 were transmitting, they will not be noticed, or will be blocked, due to the narrow receiving characteristic of the communica¬tion device 8, cf. directional characteristic 10' in Fig. 3. In this respect, primarily the receiving char¬acteristic must be defined to be narrow, with the transmitting characteristic theoretically also possibly being adapted to be less narrow - if also the OBUs of other vehicles are "woken up" by the transmitter 26, the receiver 29 will not receive their signals. Vice versa, it is also conceivable to design only the trans¬mitter 26 with a narrow radiation characteristic, if other vehicle OBus cannot transmit and only the desired OBU 9 is "woken up" so that it will be ensured that

only signals from the one desired OBU 9 are received even if receiver 29 has a wider receiving characterist¬ic. Preferably, however, both the transmitter 26 and also the receiver 29 have the indicated narrow direc¬tional characteristic for the desired selectivity.
OBU 9 which is respectively in or on vehicle 5 (or 6,'7, respectively) is equipped in a conventional man¬ner, e.g. with a close range communication device 20, i.e. a so-called DSRC communication device, and in memory 24 the respective relevant data that can be in¬terrogated by communication device 8 are stored. These data may, e.g., relate to the la.st twenty toll transac¬tions, or they may also relate to a parking permit, an electronic license etc. If OBU 9 receives an interroga¬tion command (communication command) from communication device 8, it will answer in accordance with the inter¬rogation command by delivering the desired data via the close-range communication unit 20. The transmission-re¬ceiving characteristic of OBU 9 in this case is not ad¬apted to be just as narrow which, however, is sufficient for the present use since the receiving characteristic 10' of the mobile communication device 8 is accordingly narrow so that data can only be received

from the sighted OBU 9.
In Fig. 3, also the keyboard 17 for entering data, particularly identifying data relating to the next toll site for storing them in memory 27, is indicated, the keyboard 17 being connected to the microprocessor 25.
Transmitter 2 6 and receiver 29 may be designed in a per se conventional manner which is not explained in detail here, e.g. as an infrared transmitter and an in¬frared receiver, respectively, having the desired optic elements (IR diode and photosensitive diode, as well as associated electronics for a pulsed mode of operation).
From Fig. 4, the sequence during an inquire for checking an OBU 9 in a vehicle 5 can be seen, wherein after turning on the communication device 8 (cf. block 3 0 in Fig. 4) and a ready-indication on display 16 ac¬cording to block 31 it is inquired, cf. field 32 in Fig. 4, whether adjustments such as relating to the date and time or relating to the toll site identifica¬tion are desired. If so, an appropriate data input will be effected according to block 33, via keyboard 17, and the device then is in a waiting position which is also achieved if no adjustments are desired.
If a vehicle is sighted and a selective communica-

tion is desired with the OBU 9 thereof, triggering of the transmitter 2 6 of the communication device 8 is ef¬fected by actuating the switch 19, as illustrated in Fig. 4 at 34. Accordingly, wake-up signals and inquiry signals are sent to OBU 9 according to blocks 35 and 36, respectively, in Fig. 4, and subsequently it is each inquired whether or not an answer, such as the OBU identification (cf. field 37) or the desired data (cf. field 38) have been received. If not, one error indica¬tion each is triggered, cf. blocks 39 and 40, these er¬ror indications being acoustic, by different buzzing signals, which are delivered via the loudspeaker 18. In parallel thereto, an optic indication is caused via the LCD indicating unit 16.
When the OBU identification has been effected and the desired data have been received, the latter are stored according to block 41, and optionally are prin¬ted out via a printer not further illustrated, and the procedure finally is confirmed to have duly been ter¬minated according to block 42.